A can complete a certain work in 30 days. A started the work and B joined him after 4 days then the total work gets completed in total 20 days. In how many days can B alone complete the work?

A can complete a certain work in 30 days. A started the work and B joi

1.	A can complete a certain work in 30 days. A started the work and B joined him after 4 days then the total work gets completed in total 20 days. In how many days can B alone complete the work?
A.	48
B.	42
C.	50
D.	45
Answer» B. 42

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A can complete a certain work in 30 days. A started the work and B joined him after 4 days then the total work gets completed in total 20 days. In how many days can B alone complete the work?

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